2105221111 has 4 divisors (see below), whose sum is σ = 2405966992. Its totient is φ = 1804475232.

The previous prime is 2105221093. The next prime is 2105221141. The reversal of 2105221111 is 1111225012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2105221111 - 2¹³ = 2105212919 is a prime.

It is a super-4 number, since 4×2105221111⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105221141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150372930 + ... + 150372943.

It is an arithmetic number, because the mean of its divisors is an integer number (601491748).

Almost surely, 2^2105221111 is an apocalyptic number.

2105221111 is a deficient number, since it is larger than the sum of its proper divisors (300745881).

2105221111 is an equidigital number, since it uses as much as digits as its factorization.

2105221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300745880.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 2105221111 is about 45882.6885764119. The cubic root of 2105221111 is about 1281.6395638065.

Adding to 2105221111 its reverse (1111225012), we get a palindrome (3216446123).

The spelling of 2105221111 in words is "two billion, one hundred five million, two hundred twenty-one thousand, one hundred eleven".